JP2007037244A5 - - Google Patents

Claims (8)

A cylindrical magnet which is multipolarly magnetized in the circumferential direction and has an inner peripheral surface and an outer peripheral surface ;
A rotor formed of a soft magnetic material and fixed to the inner peripheral surface of the magnet;
First and arranged to face the outer peripheral surface with a predetermined gap between the outer peripheral surface of a predetermined angular phase are arranged, respectively, on the shift position and the magnet of the rotational center as a reference of the magnet A second outer magnetic pole portion;
Third and fourth outer sides arranged respectively corresponding to the first and second outer magnetic pole portions and arranged to face the outer peripheral surface with a predetermined gap between the outer peripheral surface and the magnet. A magnetic pole,
An annular first coil for exciting the first outer magnetic pole part and the third outer magnetic pole part;
And a second coil of annular exciting said fourth outer magnetic pole portion and the second outer magnetic pole portion,
The first and second coils are arranged adjacent to the magnet in the axial direction of the rotor,
The first outer magnetic pole portion is inserted inside the first coil, and the second outer magnetic pole portion is inserted inside the second coil.
The third outer magnetic pole portion is disposed in proximity to the first outer magnetic pole portion in the circumferential direction of the magnet,
The drive device according to claim 4, wherein the fourth outer magnetic pole portion is disposed adjacent to the second outer magnetic pole portion in a circumferential direction of the magnet . The first and second outer magnetic pole portions extend along the rotation axis of the rotor toward the third and fourth outer magnetic pole portions,
2. The driving apparatus according to claim 1, wherein the third and fourth outer magnetic pole portions extend toward the first and second outer magnetic pole portions along a rotation axis of the rotor . The rotor has a rotation axis;
A first stator in which the first and second outer magnetic pole portions are integrally formed is disposed at one end of the rotating shaft of the rotor,
Wherein the other end of the rotary shaft of the rotor, the third and the outer magnetic pole portion of the fourth driving apparatus according to claim 1, wherein the arranged second stator formed integrally. The first and second stators have first and second flat plate portions extending perpendicular to the rotation axis of the rotor, respectively.
The first and second outer magnetic pole portions extend from the first flat plate portion toward the third and fourth outer magnetic pole portions,
4. The driving apparatus according to claim 3, wherein the third and fourth outer magnetic pole portions extend from the second flat plate portion toward the first and second outer magnetic pole portions . 5. The rotor has a core and a rotating shaft that passes through the core;
A portion of the core facing the first outer magnetic pole portion generates a magnetic flux across the magnet between the first outer magnetic pole portion and the first coil when energizing the first coil. Forming part,
A portion of the core facing the second outer magnetic pole portion generates a magnetic flux across the magnet between the second outer magnetic pole portion and the second coil when energizing the second coil. driving apparatus according to claim 1, characterized in that to form the part. The drive device according to claim 1 , wherein the rotor has a core and a rotating shaft that passes through the core, and the rotating shaft and the core are configured separately . The drive device according to claim 1, wherein the rotor includes a core and a rotating shaft that passes through the core, and the rotating shaft and the core are integrally formed. A bobbin on which both the first and second coils are wound;
The drive device according to claim 1, wherein the bobbin has a cover portion that covers the magnet.